Seat belt reminder warning Beep

[Jord]

Has anyone figured out how to defeat the seat belt warning beep? I find it super annoying when I'm driving by myself and rest my hand on the passenger seat and it starts beeping like crazy. I have seen some codes for the avalon, corolla, etc. but they don't seem to work for the 2007 Yaris. The codes involved using the trip reset button. I hope there is a way to get rid of it, I hate having to keep the passenger side seat belt buckled up just to be able to throw a knapsack on it. Any help would be much appreciated.